AIM: This paper aims at supplying a scientific basis for standardizing the normal reference value of whole blood viscosity (230s(-1)) of Chinese old women. METHODS: The research is made to study the relationship between the normal reference value of 6707 samples of whole blood viscosity (230s(-1)) of old women and seven geographical factors in 70 areas in China. RESULTS: It is found that the correlation between geographical factors and the normal reference value of whole blood viscosity (230s(-1)) of old women is quite significant (F=30.137, P=0.000). According to the normal reference value of old women's whole blood viscosity (230s(-1)) and geographical factors, one regression equation is inferred by using the method of enter regression analysis: Ŷ=13.47+0.0006383X1-0.001083X2-0.1379X3-0.05098X4-0.0008578X5-0.06221X6+0.2114X7±0.55. In the above equation, Ŷ is the reference value of whole blood viscosity (230s(-1)) of old women (mPa·s); X1 is the altitude (m); X2 is the annual sunshine duration (h); X3 is the annual mean air temperature; X4 is the annual mean relative humidity; X5 is the annual precipitation amount; X6 is the annual range of air temperature; X7 is the annual mean wind speed (m/s); and 0.55 is the value of the residual standard deviations. CONCLUSION: If geographical values are obtained in a certain area, the normal reference value of whole blood viscosity (230s(-1)) of old women in this area can be obtained by using the regression equation. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, Middle and lower reaches of the Yangtze River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.
AIM: This paper aims at supplying a scientific basis for standardizing the normal reference value of whole blood viscosity (230s(-1)) of Chinese old women. METHODS: The research is made to study the relationship between the normal reference value of 6707 samples of whole blood viscosity (230s(-1)) of old women and seven geographical factors in 70 areas in China. RESULTS: It is found that the correlation between geographical factors and the normal reference value of whole blood viscosity (230s(-1)) of old women is quite significant (F=30.137, P=0.000). According to the normal reference value of old women's whole blood viscosity (230s(-1)) and geographical factors, one regression equation is inferred by using the method of enter regression analysis: Ŷ=13.47+0.0006383X1-0.001083X2-0.1379X3-0.05098X4-0.0008578X5-0.06221X6+0.2114X7±0.55. In the above equation, Ŷ is the reference value of whole blood viscosity (230s(-1)) of old women (mPa·s); X1 is the altitude (m); X2 is the annual sunshine duration (h); X3 is the annual mean air temperature; X4 is the annual mean relative humidity; X5 is the annual precipitation amount; X6 is the annual range of air temperature; X7 is the annual mean wind speed (m/s); and 0.55 is the value of the residual standard deviations. CONCLUSION: If geographical values are obtained in a certain area, the normal reference value of whole blood viscosity (230s(-1)) of old women in this area can be obtained by using the regression equation. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, Middle and lower reaches of the Yangtze River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.